SPECIFICATIONS 

Brand: Patek Philippe
Model: Celestial 
Reference Number: 6102P-001
Movement: Automatic 
Condition: Unworn
Gender: Men’s
Box: Yes
Papers: Yes

THE CALIBER

Caliber: 240 LU CL C
Jewels: 45

THE CASE

Case Material: Platinum 950, diamond at 6 o’clock
Case Diameter: 44 mm
Thickness: 10.6 mm
Waterproof: 100 ft./ 30 m./ 3 ATM
Bezel Material: Fixed platinum
Glass: Sapphire Crystal  
Caseback: Open
Dial:  Blue sky chart, three metalized sapphire-crystal discs as well as ellipse framing the portion of the sky visible from Geneva
Dial Numerals: White painted Arabic numerals date scale around the outer rim

THE BRACELET / STRAP

Bracelet Material: Night Blue Leather
Buckle: Fold-over 
Buckle Material: Platinum

THE FUNCTIONS

Hours, Minutes, Seconds, Date, display sky chart and phases and orbit of the Moon, 48-hour power reserve

FURTHER READING 

Round shape case
Skeletonized white-lacquered gold leaf-shaped hands. Microscopically accurate starfield disc. Arabic numerals and direction markers
Central date hand that points at the date scale on the outermost periphery of the sapphire-crystal
Two push/pull platinum crowns, both embossed with the Calatrava cross, the one at 2 o'clock winds the watch and sets the time, the other at 4 o'clock sets the astronomical indications.
Sapphire crystal display case back.
The Reference 6102, a Patek Philippe astronomical Grand Complication, presents several exceptionally uncommon functions in a wristwatch. It permanently showcases the heavenly canopy over the northern hemisphere, emulating the apparent movement of the stars and the positions and phases of the moon in the course of a lunar cycle.
The central ellipse frames the angular part of the sky visible at latitude 46'20''. Three separate sapphire crystal discs rotate around the dial. The night sky of the Northern Hemisphere rotates counter-clockwise, showing the passage of the sky relative to the meridian of Sirius (the brightest star second only to our own Sun). The sidereal day of 23 hours, 56 minutes, and 4.09892 seconds is measured by the passage of the fixed star Sirius (indicated on the dial via a special arrow). The waxing and waning of the moon are shown on a secondary dial, displaying both lunation - the time between two full moons, which is on average 29 days, 12 hours, 44 minutes, and 2.82 seconds - and the lunar day - the time between two passages of the moon across its meridian, being 24 hours, 50 minutes and 28,328 seconds.
The Patek Philippe caliber 240 LU CL comprises 315 parts, 22K gold off-center mini-rotor, a Gyromax balance, Geneva Seal. 
This mechanism oscillates at the frequency of 21 600 vph (3 Hz)
Limited edition, only 35 examples are produced per year
First production year 2012
Complete (box and papers dated 2019)